US would only quit Iran nuclear deal if Tehran were to renege, Biden pledges

President makes commitment alongside Germany, France and UK not to repeat Donald Trump's walkout on agreement

Joe Biden has given a pledge that if the US returns to the Iran nuclear agreement, it will only subsequently leave if Tehran clearly breaks the terms of the deal.

The US president made the commitment, which addresses one of Iran's key negotiating demands, in a joint statement issued with Germany, France and the UK. The statement followed a meeting on the margins of the G20 in Rome attended by Biden, Germany's Angela Merkel, France's Emmanuel Macron and Britain's Boris Johnson.